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from fastapi import APIRouter, HTTPException, Request
from fastapi.responses import PlainTextResponse, Response

router = APIRouter()


@router.get("/metrics", response_class=PlainTextResponse, tags=["Utilities"])
def metrics(request: Request) -> PlainTextResponse:
    return request.app.engine.metrics()


@router.get("/health/ready", tags=["Utilities"])
def ready(request: Request) -> Response:
    if not request.app.engine:
        raise HTTPException(status_code=500, detail="No attached inference engine")

    if not request.app.engine.ready():
        raise HTTPException(
            status_code=400,
            detail="Attached inference engine is not ready for inference requests.",
        )

    return Response(status_code=200)
